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Projection Printing
Projection printing, keep away from mask damage entirely. An image of the patterns on the mask is projected onto the resist-coated wafer, which are many centimetres away. In order to achieve high resolution, only a small portion of the mask is imaged. This small image field is scanned or stepped above the surface of the wafer. Projection printers that step the mask image over the wafer surface are known as step-and-repeat systems. Step-and-repeat projection printers are able of approximately 1-micron resolution.
numericals
assignment
DISTILLATION
how to reduce COD in primary process effluent treatment system
The functions of the oxide layer are to: 1. mask against diffusion or ion-implant 2. passivate the surface electrically and chemically 3. isolate one device from another
Diffusion: Molecular diffusion, often known as simply diffusion, is a net transport of molecules from a region of higher concentration to one of lower concentration by chance mole
chemistry separate the mixture of sand and naphthalene by sublimation
Projection Printing Projection printing, keep away from mask damage entirely. An image of the patterns on the mask is projected onto the resist-coated wafer, which are many cen
1. Wastewater leaving the ACME cheese factory must be neutralized to a pH between 6.8 and 7.2. Citric acid is available to decrease pH and sodium hydroxide is used to increase pH.
A sample of water is found to contain , Temporary Mg hardness = 20mg/L,Calcium Sulphate =20 mg/L. Calculate Temporary and Pemanent hardness in water.
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